Bug 162255

Summary: CAN-2005-1175 krb5 buffer overflow in KDC
Product: Red Hat Enterprise Linux 3 Reporter: Josh Bressers <bressers>
Component: krb5Assignee: Nalin Dahyabhai <nalin>
Status: CLOSED ERRATA QA Contact: Brian Brock <bbrock>
Severity: medium Docs Contact:
Priority: medium    
Version: 3.0CC: security-response-team
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard: impact=moderate,embargo=20050712,source=mit,reported=20050426
Fixed In Version: RHSA-2005-562 Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2005-07-12 18:19:04 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description Josh Bressers 2005-07-01 18:26:28 UTC 
+++ This bug was initially created as a clone of Bug #157103 +++

Additionally, the same request, when received by the KDC via either
TCP or UDP, can trigger a bug in the krb5 library which results in a
single-byte overflow of a heap buffer.  Additionally, application
servers are vulnerable to a highly improbable attack, provided that
the attacker controls a realm sharing a cross-realm key with the
target realm. [CAN-2005-1175]

An unauthenticated attacker may be able to use this vulnerability
to execute arbitrary code on the KDC host, potentially compromising an
entire Kerberos realm.  No exploit code is known to exist at this
time.  Exploitation of these vulnerabilities is believed to be
difficult.
Comment 1 Josh Bressers 2005-07-01 18:27:43 UTC 
This issue also affects RHEL2.1
Comment 2 Josh Bressers 2005-07-07 12:58:08 UTC 
According to MIT, the attacker must control a realm sharing a cross-realm key
with the target realm.  I'm lowering the severity to "moderate".
Comment 3 Mark J. Cox 2005-07-12 18:00:53 UTC 
Public at http://web.mit.edu/kerberos/www/advisories/, removing embargo
Comment 4 Red Hat Bugzilla 2005-07-12 18:19:05 UTC 
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHSA-2005-562.html